I have a 20g Seagate drive. I haven't changed anything on my system, I built it about a year and a half ago. Out of the blue, on boot, I got an error that said "No logical partition" and it wouldn't boot. So in DOS I went to FDISK and it showed 2 partitions with100% use. There's plenty of free space on the disk, so I kept trying. Next, it wouldn't detect the hard drive at all. I have tried another hard drive on both IDE connections as master and slave and it works fine. The drive has power. If I jumper it as master, it will try to autodetect it for about two minutes and then say "Not Detected". If it is jumpered any other way, it will just blow past it and say "Not Detected". I've tried Partition Magic to boot it, and emergency boot disks, but no luck. I've also tried it in two other pc's and no dice. Please help this poor blonde girl! It's beyond me!